Abstract
In this study, the phase diagram and electric properties were demonstrated for a (Mn, K)-modified Bi0.5Na0.5TiO3 (BNT)-based solid solution. (0.935−x) Bi0.5Na0.5TiO3−xBi0.5K0.5TiO3−0.065BaTiO3 with 0.5% mol Mn doping was prepared by a conventional solid-state reaction method. A morphotropic phase boundary (MPB) formed between the ferroelectric rhombohedral and tetragonal phases around x of 0.04 with the MPB tolerance factor t of 0.984–0.986. The temperature and composition dependence of the dielectric, piezoelectric, ferroelectric properties along with the strain characteristics were investigated in detail and a phase diagram was presented. Around the MPB region, the maximum values of piezoelectric constant \( d_{33}^{*} \) of 290 pC/N, d 33 of 155 pC/N, dielectric constant \( \varepsilon_{33}^{T} /\varepsilon_{0} \) of 1059 and low dielectric loss tangent tan δ of 0.017 were obtained. In addition, the authors also suggest that the solid solution with composition x of 0.24, exhibiting both high-depolarization temperature T d of 182 °C, \( d_{33}^{*} \) of 156 pC/N, d 33 of 130 pC/N, will be favorable for high-temperature actuator and sensor applications.
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Acknowledgement
This study was supported by the Science and Technology Commission of Shanghai Municipality (Grant no. 10ZR1422300 and 09520501000), the Innovation Program of Shanghai Municipal Education Commission (Grant no. 11YZ82, 11YZ83, and 11ZZ117), Shanghai Normal University Program (SK201026 and PL929), National Natural Science Foundation of China (Grant no. 60807036), and Condensed Physics of Shanghai Normal University (Grant no. DZL712).
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Xu, M., Wang, F., Wang, T. et al. Phase diagram and electric properties of the (Mn, K)-modified Bi0.5Na0.5TiO3–BaTiO3 lead-free ceramics. J Mater Sci 46, 4675–4682 (2011). https://doi.org/10.1007/s10853-011-5374-2
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DOI: https://doi.org/10.1007/s10853-011-5374-2